linux-kernel - [PATCH 5.15 106/196] dpaa2-eth: Initialize mutex used in one step timestamping path

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Date:   Mon, 21 Feb 2022 09:48:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Radu Bulie <radu-andrei.bulie@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.15 106/196] dpaa2-eth: Initialize mutex used in one step timestamping path

From: Radu Bulie <radu-andrei.bulie@....com>

commit 07dd44852be89386ab12210df90a2d78779f3bff upstream.

1588 Single Step Timestamping code path uses a mutex to
enforce atomicity for two events:
- update of ptp single step register
- transmit ptp event packet

Before this patch the mutex was not initialized. This
caused unexpected crashes in the Tx function.

Fixes: c55211892f463 ("dpaa2-eth: support PTP Sync packet one-step timestamping")
Signed-off-by: Radu Bulie <radu-andrei.bulie@....com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -4329,7 +4329,7 @@ static int dpaa2_eth_probe(struct fsl_mc
 	}
 
 	INIT_WORK(&priv->tx_onestep_tstamp, dpaa2_eth_tx_onestep_tstamp);
-
+	mutex_init(&priv->onestep_tstamp_lock);
 	skb_queue_head_init(&priv->tx_skbs);
 
 	priv->rx_copybreak = DPAA2_ETH_DEFAULT_COPYBREAK;